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BUG: KASAN: slab-out-of-bounds in change_page_attr_set_clr+0x625/0xfc0
Read of size 8 at addr ffff88811392f408 by task syz.3.9845/30062

CPU: 0 UID: 0 PID: 30062 Comm: syz.3.9845 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 change_page_attr_set_clr+0x625/0xfc0
 _set_pages_array+0x145/0x270
 drm_gem_shmem_get_pages_locked+0x2d0/0x440
 drm_gem_shmem_pin_locked+0x22c/0x460
 drm_gem_map_attach+0x19c/0x1f0
 dma_buf_dynamic_attach+0x1ea/0x3d0
 drm_gem_shmem_prime_import_no_map+0xc1/0x2f0
 drm_gem_prime_fd_to_handle+0x196/0x4d0
 drm_ioctl_kernel+0x2cf/0x390
 drm_ioctl+0x67f/0xb10
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb0f258ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb0f07f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb0f27c5fa0 RCX: 00007fb0f258ebe9
RDX: 0000200000000300 RSI: 00000000c00c642e RDI: 0000000000000008
RBP: 00007fb0f2611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb0f27c6038 R14: 00007fb0f27c5fa0 R15: 00007ffce36302b8
 </TASK>

Allocated by task 30062:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kvmalloc_node_noprof+0x5cd/0x910
 drm_gem_get_pages+0x166/0xa20
 drm_gem_shmem_get_pages_locked+0x201/0x440
 drm_gem_shmem_pin_locked+0x22c/0x460
 drm_gem_map_attach+0x19c/0x1f0
 dma_buf_dynamic_attach+0x1ea/0x3d0
 drm_gem_shmem_prime_import_no_map+0xc1/0x2f0
 drm_gem_prime_fd_to_handle+0x196/0x4d0
 drm_ioctl_kernel+0x2cf/0x390
 drm_ioctl+0x67f/0xb10
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88811392f000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 0 bytes to the right of
 allocated 1032-byte region [ffff88811392f000, ffff88811392f408)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113928
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a842000 ffffea0004173e00 dead000000000002
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801a842000 ffffea0004173e00 dead000000000002
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 057ff00000000003 ffffea00044e4a01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 12686, tgid 12686 (kworker/u10:10), ts 345759677290, free_ts 253264215299
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x330
 ___slab_alloc+0xbd1/0x13f0
 __slab_alloc+0x55/0xa0
 __kmalloc_node_track_caller_noprof+0x5c7/0x800
 kmalloc_reserve+0x136/0x290
 pskb_expand_head+0x18e/0x1150
 netlink_trim+0x1d5/0x2e0
 netlink_broadcast_filtered+0xd6/0x1000
 nlmsg_notify+0xf0/0x1a0
 rtnetlink_event+0x224/0x270
 notifier_call_chain+0x1b6/0x3e0
 netdev_lower_state_changed+0xc6/0x140
page last free pid 8146 tgid 8146 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 vfree+0x25a/0x400
 kcov_close+0x28/0x50
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 do_exit+0x6b5/0x2300
 do_group_exit+0x21c/0x2d0
 __x64_sys_exit_group+0x3f/0x40
 x64_sys_call+0x21f7/0x2200
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88811392f300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811392f380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88811392f400: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                      ^
 ffff88811392f480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811392f500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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